Relationship between d.c. volts and electrolysis in steel

[stevecarson]

We use a 10v a.c. signal through to a small steel sensor (SMO 254) in wastewater - and the control device looks for a conductive path to ground to determine that the level of liquid is over the sensor.

We don't use d.c. because of the electrolysis effect - but the circuit we use could have a d.c. component - which might mean that over a period of time the sensor gets eaten away.

Is there a graph or formula for increases in d.c. voltage vs electrolysis effect (e.g. mm/yr)?

Thanks
Steve
Brisbane

 

[Astronuc]

One probably wants to find the polarization curve, i.e. applied potential vs log I (current), for SMO 254.

 

[oswaler]

The relationship between d.c. volts and electrolysis in steel is a complex one and cannot be represented by a simple graph or formula. This is because the rate of electrolysis is affected by various factors such as the composition and properties of the steel, the type and concentration of electrolyte, and the specific conditions of the environment in which the steel is placed.

However, it is known that higher d.c. voltages can lead to increased rates of electrolysis in steel. This is because d.c. voltage creates an electric current that flows through the steel and causes an exchange of ions between the steel and the electrolyte. This exchange can lead to the formation of corrosion products on the surface of the steel, which can result in the degradation of the steel over time.

In the context of your specific application, using a 10v a.c. signal is a wise choice to avoid excessive electrolysis and potential damage to the sensor. It is important to regularly monitor the condition of the sensor and replace it if signs of corrosion or degradation are observed. Additionally, proper maintenance and control of the electrolyte concentration can also help mitigate the effects of electrolysis.

In summary, while there is no specific formula or graph for the relationship between d.c. voltage and electrolysis in steel, it is important to carefully consider the potential effects of d.c. voltage in your application and take appropriate measures to prevent damage to the steel sensor.